Page 824 - 2021 Sierra Catalog
P. 824
806
➃ 3” (76mm) rise
➄ 6” (152mm) rise
➅ Port
➆ Starboard
➇ Engines with risers or closed cooling may require a different gasket than listed
Liter Model
# Cyl.
377 8 377 8
377 8 377 8 427 8 427 8 427 8 427 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8
454 8
454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8 454 8
Stroke Year Range
4 2003-2007 4 2003-2007
4 2008-2010 4 2008-2010 4 1968
4 1968-1974 4 1968
4 1968-1974 4 1977-1981 4 1982-1987 4 1982-1987 4 1977-1981 4 1981-1987 4 1981-1987 4 1981-1987 4 1974-1975 4 1976
4 1978-1985 4 1985-1987 4 1980-1986 4 1987-1989 4 1990-1992 4 1983-1986 4 1995-1996 4 1995-1996 4 1995-1996 4 1986-1988 4 1988-1997 4 1994-1996 4 1995-1996 4 1996-1997 4 1998-2001
4 1999-2001
4 1996-1997 4 1991-1996 4 1991-1996 4 1991-1996 4 1991-1996 4 1991-1996 4 1991-1996 4 1988-1997 4 1996-1997 4 1988-1992 4 1988-1992 4 1988-1992 4 1989-1992 4 1992-1997 4 1998-2001 4 1995-1997 4 1998-2001
Serial # Range
M391600 - W698432
M391600 - W698432
W698433 & UP
W698433 & UP
2278747 - 2313964
2313965 - 3780449
2278747 - 2313964
2313965 - 3780449
4623115 - 6083144
6083145 - B816540
6083145 - B816540
4623115 - 6083144
5889914 - B788365
5889914 - B788365
5889914 - B788365
3780450 - 4501640
4501641 - 4623109
4179554 - 6721527
6721528 - B714586
4179554 - B457644
A398941 - B622418
G398941 - D937011
4179554 - B485220
F347100 - F347277
F347100 - F347277
F347100 - F347277
A631894 - B785148
B721206 - K999999
F115700 - F802349
F215800 - F820099
F802350 - K999999
L010029 - M0224999
L086050 - L674000
F820100 - K999999 D456000 - F877734 D456000 - F877734 D456000 - F877734 D456000 - F877734 D456000 - F877734 D456000 - F877734 B771113 - K999999 F874815 - K999999 B788366 - D715493 B788366 - D715493 B788366 - D715493 C391564 - D715493 D715494 - K999999 L010003 - M024330 F563052 - K999999 L002006 - L674613
Exh. Manifold Port
6.2L MX 6.2L
BLACK SCORPION SKI
6.2L MX 6.2L
BLACK SCORPION SKI
6.2L SCORPION 377 6.2L SCORPION 377 7.4L 325
7.4L 325
7.4L 325 7.4L 325 7.4L 330 7.4L 330 7.4L 330 7.4L 330 7.4L 340 7.4L 340 7.4L 340 7.4L 350 7.4L 350 7.4L 370 7.4L 370 7.4L 400 7.4L 420 7.4L 425 7.4L 440 7.4L 450 7.4L 450 7.4L 450 7.4L 454 7.4L 454 7.4L 454 7.4L 454 7.4L 454 7.4L 454
MIE MIE
MIE MIE MIE MIE MIE MIE TRS TRS TRS
TRS
W/BW W/BW W/BW
18-1957-2 18-1957-2
18-1957-2 18-1957-2 18-1957-2
18-1957-2
18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2
18-1957-2 18-1957-2
18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2
18-1957-2 18-1957-2
18-1957-2 18-1957-2 18-1957-2
18-1957-2
18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2
18-1957-2 18-1957-2
18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2 18-1957-2
18-1970-2 ❹ 18-1976-2 ❺
18-1974-1 ❸ 18-1970-2 ❹ 18-1976-2 ❺
18-1976-2
➁
➃
➄ 18-1976-2 18-1976-2 18-1976-2 18-1976-2 18-1976-2 18-1976-2
18-1976-2 18-1976-2
➁
➃
➄
➁
➃
➄ 18-1976-2 18-1976-2 18-1974-1 ❸ 18-1970-2 ❹ 18-1976-2 ❺ 18-1976-2 18-1976-2 18-1976-2 18-1976-2 18-1976-2
MAG ALPHA
MAG BRAVO
MAG EFI
MAG EFI / 454 MAG SKI MAG MPI
MAG MPI
7.4L 454
HORIZON / 454 MAG MIE
MAG MPI / 454 MAG
7.4L 454 MAG MPI / 454 MAG SKI 7.4L 525 SC W/BRAVO
7.4L 525 SC W/BRAVO
7.4L 525 SC W/BRAVO
7.4L 525 SC W/SSM 7.4L 525 SC W/SSM 7.4L 525 SC W/SSM 7.4L 7.4L BRAVO
7.4L 7.4L EFI / 7.4L MIE
7.4L 7.4L MIE 7.4L 7.4L MIE 7.4L 7.4L MIE 7.4L 7.4L MIE 7.4L 7.4L MIE 7.4L 7.4L MPI 7.4L 7.4L MPI 7.4L 7.4L MPI
W/BW W/BW W/BW W/HURTH
/ 7.4L MIE / 7.4L MIE
❶ For engines with aluminum exhaust manifolds ❷ For engines with cast iron exhaust manifolds ❸ 3” (76mm) O.D. & 0 degree down angle
❹ 3” (76mm) O.D. & 15 degree down angle
❺ 4” (102mm) O.D.
❻ 2 piece exhaust manifold
❼ 1 piece exhaust manifold
❽ Has a rectangular elbow mounting bolt pattern ❾ Has a square elbow mounting bolt pattern
❿ In-line applications ➀ V-drive applications ➁ Standard rise
➂ 2” (51mm) rise
➈ Exhaust manifold with external water rail
➉ Exhaust manifold w/o external water rail
☛ 1 piece exhaust manifold is nla. Rngine must be converted to
the 2 piece exhaust system
♠ Engines with easy drain system
♣ Engines with multi-point drain system ♥ Intermediate collector housing
Note CID
Exh. Manifold Starboard
Exh. Elbow
End Cap Front
18-4009
18-4009 18-4009
18-4009
18-4009 18-4009 18-4009
18-4009
End Cap Rear
18-1990
18-1990 18-4009
18-4009
18-1990 18-4009 18-1990
18-1990
Manifold Exh. Elbow Gasket Gasket
18-2949 18-2949
18-2949
18-2949
18-0418
18-0418 18-0885-1 18-0418
18-0418 18-0885-1 18-0418 18-0885-1 18-0418 18-0897 18-0418 18-0897 18-0418 18-0885-1 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0885-1 18-0418 18-0885-1 18-0418 18-0885-1 18-0418 18-2849-1 18-0418 18-0885-1 18-0418
18-0418
18-0418
18-0418
18-0418
18-0418
18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-2849-1
18-0418 18-2849-1
18-0418 18-0897 18-0418
18-0418
18-0418
18-0418
18-0418
18-0418
18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-0897 18-0418 18-2849-1 18-0418 18-0897 18-0418 18-2849-1
MANIFOLD/MANIFOLD GASKET APPLICATION (Cont.)
I/O — MERCRUISER - Cooling System
